# CVE-2026-71959: Bitwarden Server < 2026.7.2 Audit Log Injection via POST /collect

Status: published. Published: 2026-08-10. Updated: 2026-11-08.

Bitwarden Server before 2026.7.2 does not verify that the caller is a member of the organization identified in a POST /collect request body, allowing any authenticated user to write forged, arbitrarily backdated entries into any organization's audit log.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/bitwarden/server/pull/7934
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/bitwarden/server/commit/2aa92a3c8675a28e305e8207ff16592227f96291

## Affected products and versions

- bitwarden / server (bitwarden/server): ≥ 0; < 2026.7.2 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.8 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.48% as of 2026-11-08; percentile 41.41%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

- exploit: https://sanjokkarki.com.np/blog/bitwarden-audit-log-forgery (CNA: VulnCheck)

## References

- https://sanjokkarki.com.np/blog/bitwarden-audit-log-forgery (CNA: VulnCheck; technical-description, exploit)

- https://github.com/bitwarden/server/releases/tag/v2026.7.2 (CNA: VulnCheck; release-notes)

- https://github.com/bitwarden/server/pull/7934 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/bitwarden/server/commit/2aa92a3c8675a28e305e8207ff16592227f96291 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/bitwarden-server-audit-log-injection-via-post-collect (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-71959; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-71959; retrieved 2026-11-08; source updated Not reported

Revision: 4ca1cd172442d3cf8809757cdcb04eb0ab2dca2ed942a2a6ca90aee6c8ff9587

Canonical: https://y2.dev/cve/CVE-2026-71959

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